Sterling and 14 K Brutalist Brooch

Unique, signed brooch from the brutalist era. It is clearly stamped 14k and also stamped sterling. There are gold accents on circle component in the design. The wonderful large fluid body is sterling. There is a makers / designer mark , I have not been successful in my research to reference. It looks like an x or an h depending on how you hold it, in a rectangle. It is approximately 2.25 inches long, 1.5 inches at widest.